Abstract
The major objective of this project is to use phase-change materials (PCMs) as integrated components in passive solar heat recovery systems. The suggested approach involves experimental investigations and characterization of the global behavior of a parallelepiped “material wrap” filled with the PCM. The experimental apparatus permits simultaneous measurements of heat fluxes and temperatures. It also allows imposing and measuring temperatures variations with respect to selected time scales between the two predominant faces of the sample. The instantaneous heat flux measurements allow the determination of the “apparent” or overall heat storage capacities and thermal conductivities of the PCM—in the solid and liquid states—and that of the latent heat of melting. Results were found to be very satisfactory.
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Abbreviations
- T :
-
Temperature, °C
- ΔT :
-
Temperature difference, °C
- φ :
-
Density of heat flux, W · m−2
- Q :
-
Total stored energy, J
- C :
-
Specific heat, J · kg−1 · K−1
- L :
-
Latent heat of melting, J · kg−1
- e :
-
Thickness, m
- k :
-
Thermal conductivity, W · m−1 · K−1
- m :
-
Mass, kg
- t :
-
Time, h
- l:
-
Liquid state
- s:
-
Solid state
- melting:
-
Melting point
- initial:
-
Initial
- final:
-
Final
- int:
-
Internal face of the envelope
- ext:
-
External face of the envelope
- samp:
-
Sample (brick) which includes the PCM and its envelope
- 1:
-
Measurement on the first side of the brick
- 2:
-
Measurement on the second side of the brick
- pcm:
-
Phase change material
- end:
-
At the end, in steady state
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Younsi, Z., Zalewski, L., Lassue, S. et al. A Novel Technique for Experimental Thermophysical Characterization of Phase-Change Materials. Int J Thermophys 32, 674–692 (2011). https://doi.org/10.1007/s10765-010-0900-z
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DOI: https://doi.org/10.1007/s10765-010-0900-z